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John Fox may work from coaches box on Sunday

The Broncos are 31-13 since John Fox took over as head coach in 2011. (John Leyba/Getty Images)

After not coaching the team the last four weeks as he recovered from heart valve replacement surgery, John Fox will resume head coaching duties of the Broncos for their home game against the Titans on Sunday.

But where he'll coach from is still undetermined.

Fox's doctors will advise him whether he should coach from upstairs at Mile High Stadium, according to Mike Klis of The Denver Post. If he goes that route, his headset will have direct communication with his three coordinators — Adam Gase (offense), Jack Del Rio (defense) and Jeff Rodgers (special teams) — who always work from the sidelines.

"I don't think it is a tremendous effect one way or another," Fox said. "I communicate with the same people. I spent half of my career in the press box [as assistant coach and defensive coordinator] and another half on the field."

Fox was a defensive coordinator for the L.A. Rams (1994-95) and the Giants (1997-2001) before taking over as head coach of the Panthers in 2002.

Even if Fox works from the coaches' box, he'll likely return to the sideline for Denver's Thursday night game at home against the Chargers on Dec. 12.